Phase II: Drainage Defects Confirmed, But No Estate-Wide Strategy

 Further clarification has now been provided by Atkins and the City regarding the proposed Podium Phase II works.

Atkins have confirmed that CCTV drainage surveys were undertaken for podium downpipes within the Phase II area. According to Atkins, these surveys identified blockages and pipe defects requiring unblocking, repair and replacement as part of the proposed works.

Importantly, Atkins have also acknowledged that equivalent drainage remediation work was not undertaken as part of the earlier Phase I project.

This is significant because it now appears that substantial drainage defects have been identified within the podium drainage infrastructure itself, rather than the problem being solely one of failed waterproofing membranes or surface deterioration.

At the same time, Atkins continue to make clear that they were not asked to consider the podium drainage system from an estate-wide system level perspective. The City’s earlier FOI response also confirmed that:

• no estate-wide hydraulic modelling of the podium drainage system has been undertaken,
• no comprehensive estate-wide drainage strategy exists, and
• no drainage maintenance records are held for recent years.

In light of this, an obvious question arises: would funds be better directed toward comprehensive drainage investigation and remediation across the estate as a whole, incorporating the lessons from Phase I, before proceeding with another major programme of demolition, strip-back and resurfacing works?

Another important point is the scope of the surveys themselves. While CCTV investigation of downpipes may identify local blockages and defects, it remains unclear whether this amounts to a comprehensive assessment of the wider podium drainage system and its long-term performance.

The project therefore still appears to be a localised intervention rather than part of a coordinated estate-wide drainage strategy.

Given the scale, cost and disruption associated with the proposed works, these seem entirely reasonable questions to ask before irreversible enabling works proceed.

Phase II: Atkins Confirm No Estate-Wide Drainage Review

 

Following further correspondence with the City and Atkins regarding the Barbican Podium Phase II works, an important clarification has now been provided in writing.

Atkins have confirmed that they were not asked to consider the podium drainage system from an estate-wide system level perspective, but rather to focus on the specific water ingress issues affecting the Phase II area.

This appears to confirm that the current project should be understood as a localised surface intervention rather than part of a coordinated estate-wide drainage strategy.

That distinction matters because the City’s recent FOI response also confirmed that:

• no estate-wide hydraulic modelling of the podium drainage system has been undertaken,

• no comprehensive estate-wide drainage strategy exists, and

• no drainage maintenance records are held for recent years.

I have now asked for further clarification regarding what specific assessment of the drainage network itself has been undertaken even within the Phase II footprint.

For example, while trial holes and waterproofing investigations may help identify how water is entering the structure, they do not in themselves explain how the condition or performance of the drainage runs has been assessed, nor how confidence has been established that the proposed interventions will provide an effective long-term drainage solution.

Given the scale, cost and disruption associated with the proposed demolition and strip-back works, it seems reasonable that these technical questions should be satisfactorily resolved before irreversible enabling works proceed.

Podium Phase II: Progressing Without a Drainage Strategy?

The City has recently invited residents to a webinar on the Phase 2 podium works (details below).

By way of context, the response to a recent Freedom of Information request confirmed that:

• no estate-wide drainage strategy or modelling has been undertaken, and
• no drainage maintenance records are held for recent years.

Despite this, the City is continuing to progress the Phase 2 works, which are being presented as addressing long-standing drainage issues on the podium.

This is particularly notable given that similar drainage issues, including ponding, blocked drains and surface deterioration, are already visible on the western highwalk following the Phase 1 works.

This raises an obvious question: on what basis is it expected that these works will resolve drainage problems across the estate?

The webinar may be a useful opportunity to ask that question directly.

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Dear Residents,

Following my update on 9 March 2026, I’m writing to invite you to an online webinar to meet the contractor and hear about the enabling works planned for this summer.

While we continue to discharge the pre-commencement planning conditions required for the main works, we are pleased to confirm that Maylim have been appointed as the contractor to commence early enabling works due to start this summer, including the removal of the Yellow Link Building.

Date: Monday 18 May 2026 Time: 18.30 - 19.30

Register: Please click this link to register or contact the project team via info@barbicanprojects.co.uk

In the webinar, Maylim will introduce the team and outline the proposed programme for the enabling works, including phasing, access arrangements, working hours, noise and other key considerations.

This will be followed by a Q&A session so you can ask questions and understand how the works may affect you.

We hope you are able to attend, but don’t worry if you can’t make it. The webinar will be recorded, and the presentation and recording be available on www.barbicanprojects.co.uk afterwards.

If you have any queries on the webinar, please contact the project team via info@barbicanprojects.co.uk or 0800 772 0475.

Kind regards, Dan Sanders, Director of Property and Estate Management - Barbican